Critical severity9.8NVD Advisory· Published Mar 5, 2026· Updated May 19, 2026

CVE-2026-2743

Description

Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web Interface. The affected feature is the large file transfer (LFT).

This issue affects SeppMail: 15.0.2.1 and before

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Seppmail/SEPPmail2 versions
cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:*range: <=15.0.2.1
- (no CPE)range: unknown

Patches

Vulnerability mechanics

References

News mentions

⚡ Weekly Recap: Linux Flaws, Defender 0-Days, Router Botnets, and Supply Chain Chaos
The Hacker News · May 25, 2026
SEPPMail Secure E-Mail Gateway Vulnerabilities Enable RCE and Mail Traffic Access
The Hacker News · May 19, 2026

Severity

CriticalCVSS v3.1

9.8/ 10

CVSS v410.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

Probability of exploitation in the next 30 days.

0.84%

VYPR risk score

Composite of severity, exploitation, and reach.

0.64high

cvss	0.637
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

Weaknesses

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-434
Unrestricted Upload of File with Dangerous Type

CVE ID

CVE-2026-2743

Credits

MF
Manuel Feifel and Dario Weiss of InfoGuard Labs
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